It's Day 23 of our 100-Mile Challenge!
If you want to start adding strength work to your walking routine, planks are a great exercise to work on.
The low-impact exercise works your abs, but also strengthens the arms, back and lower body, too. Because they're so effective at strengthening the core, planks can help reduce back pain and improve stability while you walk. But performing them properly is key to reaping the benefits.
This is how to master a plank.
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